F&V BSS6 Barn Door Three-Leaf Sides Set for K4000 SE, Z400S Soft, and Z800S SoftF&V BSS6 Barn Door Three Leaf Sides Set for K4000 SE, Z400S Soft, and Z800S Soft F&V SKU: 10311008 Helix SKU: FV10311008 Overview This set of side barn doors attaches to the FAF 1 Filter Adapter Frame and the FAF 2 Filter Adapter Frame (both sold separately) to be used with the K4000 SE, Z400S Soft, and Z800S Soft 1x1 LED Lights. The barn door flags include mounting screws to attach them to the filter adapter frame. The sides are a three leaf design.